There will be a core team of their best lawyers (honors exam lawyers) but the law firms & their consulting contracts will get a direct hit - so some employees of the law department. As of now purpose-trained Davinci reaches an accuracy about 75% the costly consultants had an accuracy about 80% (they actually measured it) ... 5% less accuracy (GPT 3.5) but much less cost. If GPT 4.0 is just a bit better it will change workspace forever. You are right it works better with people but you just need the elite of each department. This bank has like core team of 5 high paid syndicus lawyers and 30 contract lawyers from law firms. They will reduce their core team to 3 and cut the contract. Now interpolate this step to every bank in EU...